Я хочу создать круг и поставить 8 точек на нем. Таким образом, пользователь может перетащить каждую точку, чтобы изменить ее форму.
Есть ли способ сделать это во флэш-памяти?
У меня есть следующий код:
Ref. - Как нарисовать непрерывную изогнутую линию из 3 заданных точек одновременно
package{import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.geom.Point;
public class SplineTest extends Sprite
{
// ====================================================================
private const A:Point = new Point(0, 0);
private var B:Point = new Point(100, 200); // yes, var.. this will change
private const C:Point = new Point(200, 0);
private const D:Point = C.subtract(A); // midpoint between A and C (I normalize it in the constructor)
private var DB:Point;
private var controlPoint:Sprite;
private var curveCanvas:Sprite;
private var move:Boolean = false;
// ====================================================================
// ====================================================================
// CONSTRUCTOR
// ====================================================================
// --------------------------------------------------------------------
public function SplineTest()
{
// normalize D to be the midpoint
D.normalize(D.length * 0.5);
// draw A and C
graphics.beginFill(0xFF0000);
graphics.drawCircle(A.x, A.y, 5);
graphics.drawCircle(C.x, C.y, 5);
graphics.endFill();
// move the root for visual convinience
x = y = 100;
DB = B.subtract(D);
// create the canvas for the curve and draw it!
curveCanvas = addChild(new Sprite()) as Sprite;
drawTheCurve();
// create the controlPoint (B) and draw it!
controlPoint = curveCanvas.addChild(new Sprite()) as Sprite;
controlPoint.graphics.beginFill(0xFF0000);
controlPoint.graphics.drawCircle(0, 0, 5);
controlPoint.x = B.x;
controlPoint.y = B.y;
// add listeners to important events (for moving the control point)
controlPoint.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);
stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
controlPoint.addEventListener(MouseEvent.MOUSE_UP, mouseUp);
}
// --------------------------------------------------------------------
private function drawTheCurve():void
{
with (curveCanvas.graphics)
{
clear();
// draw the curve
lineStyle(1, 0);
moveTo(A.x, A.y);
curveTo(B.x, B.y, C.x, C.y);
// draw D and DB
lineStyle(1, 0x00FF00);
drawCircle(D.x, D.y, 5);
moveTo(D.x, D.y);
lineTo(D.x + DB.x, D.y + DB.y);
}
}
// --------------------------------------------------------------------
private function mouseDown(event:MouseEvent):void { move = true; }
// --------------------------------------------------------------------
private function mouseMove(event:MouseEvent):void
{
if (!move) return;
// obtain the mouse position of B
B = curveCanvas.globalToLocal(new Point(event.stageX, event.stageY));
controlPoint.x = B.x;
controlPoint.y = B.y;
// if you run the next line the curve passes trough B
calculatePoints();
drawTheCurve();
}
// --------------------------------------------------------------------
private function mouseUp(event:MouseEvent):void { move = false; }
// --------------------------------------------------------------------
private function calculatePoints():void
{
DB = B.subtract(D);
B = B.add(DB);
}
}}
Итак, кто-нибудь может преобразовать эти три точки кривой в 8 точек круга?
Заранее спасибо ..